Sacred paths the world over help hikers discover deeper truths about the world and themselves. But what truly makes a path transformative? Elisabeth Kwak-Hefferan treks a new 170-mile loop in Montana in search of the pilgrimage she needs.

It’s not all sunsets and s’mores. If the parks are going to last another century, we need to renew our effort to protect and preserve them. From garbage to global warming, here are the challenges—and solutions—ahead.